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Method for preparing super metallurgy grade silicon

A metallurgical-grade silicon and ultrasonic technology, applied in the field of ultra-metallurgical-grade silicon, can solve the problems of increased difficulty in the purification process of metallurgical-grade silicon, and achieve the effects of low production costs, reduced production costs, and reduced power consumption

Inactive Publication Date: 2010-01-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inhomogeneity of impurities in metallurgical grade silicon, it adds great difficulty to the purification process of metallurgical grade silicon

Method used

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  • Method for preparing super metallurgy grade silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Metallurgical grade silicon with a silicon content of 98.5wt% is used as a raw material, wherein the main impurity components include Al content of 1100ppmw, Fe content of 1620ppmw, and Ca content of 420ppmw.

[0034] The raw material is crushed by a crusher, ball milled by a ball mill, and the metallurgical grade silicon powder is screened by a sieving machine to obtain a silicon powder material with a particle size of 150 mesh, and then an electromagnetic separator is used to remove the iron brought in during the crushing and ball milling process. Impurities.

[0035]Use hydrochloric acid with a concentration of 4mol / L to react the silicon powder material under the action of ultrasonic waves with a power of 800W for 5 minutes according to the liquid-solid ratio of 1:1, and then carry out acid leaching treatment under the action of microwaves with a power of 300W for 60 minutes, and then remove it Place in a water bath at a temperature of 50°C for leaching for 5 days, ...

Embodiment 2

[0038] Metallurgical grade silicon with a silicon content of 99.5wt% is used as a raw material, and its main impurity components are Al content of 540ppmw, Fe content of 850ppmw, and Ca content of 200ppmw.

[0039] The raw materials are crushed by a crusher, ball milled by a ball mill, and the metallurgical grade silicon powder is screened by a sieving machine to obtain a silicon powder material with a particle size of 200 mesh, and then an electromagnetic separator is used to remove iron impurities brought in during the crushing and ball milling process .

[0040] Use nitric acid with a concentration of 8 mol / L to carry out acid leaching treatment on the silicon powder material according to the liquid-solid ratio of 5:1. First, treat it under the condition of ultrasonic power of 600W for 30min, then treat it under the condition of microwave for 40min, the microwave power is 600W, and then leaching in a water bath at 60°C for 3 days, then use vacuum filtration to separate the ...

Embodiment 3

[0043] Metallurgical grade silicon with a silicon content of 99.3wt% is used as a raw material, and its main impurity component A1 content is 930ppmw, Fe content is 1320ppmw, and Ca content is 420ppmw.

[0044] The raw material is crushed by a crusher, ball milled by a ball mill, and the metallurgical grade silicon powder is screened by a sieving machine to obtain a silicon powder material with a particle size of 100 mesh, and then an electromagnetic separator is used to remove iron impurities brought in during the crushing and ball milling process .

[0045] Use hydrochloric acid with a concentration of 3mol / L according to the liquid-solid ratio of 8:1 to treat the silicon powder material under ultrasonic conditions for 5 minutes, the power is 500W, and then treat it under microwave conditions for 120 minutes, the microwave power is 1000W, and then at 90 ° C leaching in a water bath for 2 days, and then use vacuum filtration to separate the acid solution from the material, an...

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Abstract

The invention provides a method for preparing super metallurgical-grade silicon, relating and pertaining to a method for preparing high purity silicon, in particular to a method for preparing the super metallurgical-grade silicon with purity more than 99.99 percent with metallurgical-grade silicon. The invention is characterized in that: block metallurgical-grade silicon is put into an ultrasonic and microwave field for metallurgical acid leaching after being cleaned, crumbled, ball mill, sieved and preliminary impurity removed, then wet leaching at atmospheric pressure and high-temperature and high-pressure leaching are carried out upon combination to the strengthening treated metallurgical-grade silicon powder so as to leave the metal impurity in the metallurgical-grade silicon powder into the leaching solution as soon as possible, therefore, the leaching solution can be used again upon extraction and the extractant can also be used again after reverse-extraction. The invention jointly uses strengthening technologies in special fields of microwave metallurgy, ultrasonic metallurgy, high-temperature and high-pressure leaching, etc., therefore, the purity of the silicon prepared by the method is 99.99 percent or more, so as to meet the requirements for super metallurgical-grade silicon by solar cell industry. Besides, the invention has the advantages of low investment in equipment, low energy consumption, slight influence on the environment and low cost.

Description

technical field [0001] The invention relates to a method for preparing high-purity silicon, in particular to a method for preparing ultra-metallurgical-grade silicon with a purity greater than 99.99 percent from metallurgical-grade silicon. Background technique [0002] As we all know, traditional fossil energy can no longer meet the rapidly growing energy demand of mankind. The solar photovoltaic industry meets the requirements of the sustainable development strategy, and has maintained a high-speed development with an annual growth rate of more than 30% in the past ten years. The solar photovoltaic industry relies on polysilicon for solar cells. [0003] At present, solar cell materials mainly come from waste and defective products of the semiconductor industry. Traditional trichlorosilane (SiHCl 3 ) The polysilicon for solar cells directly produced by the hydrogen reduction method, that is, the Siemens method, has large investment, high production cost, poor safety per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/037
Inventor 马文会戴永年杨斌刘大春于站良谢克强魏奎先徐宝强伍继君汪镜福
Owner KUNMING UNIV OF SCI & TECH
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